soname_pattern_base "lib{libname}.so" soname_pattern_abi "lib{libname}.so.{abi_rev}.{version_minor}" soname_pattern_patch "lib{libname}.so.{abi_rev}.{version_minor}" shared_lib_symlinks no default_compiler clang posix1 posix_mlock clock_gettime dev_random arc4random getentropy explicit_bzero pledge sockets threads thread_local filesystem